[lworld] RFR: 8371826: [lworld] Migrated value classes pre-registered unconditionally

[Matias Saavedra Silva]

This patch fixes a bug where the VM tries to pre-register migrated value classes regardless of whether or not the class loader data already exists. Verified with tier 1-5 tests.

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Commit messages:
 - Merge branch 'lworld' into pre_register_classes_8371826
 - 8371826: [lworld] Migrated value classes pre-registered unconditionally

Changes: https://git.openjdk.org/valhalla/pull/1741/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1741&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371826
  Stats: 6 lines in 3 files changed: 2 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/valhalla/pull/1741.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1741/head:pull/1741

PR: https://git.openjdk.org/valhalla/pull/1741